F11
GLASS BLOCK WALLING SPECIFICATION FOR ROGER WILDE '60/28.5 FIREBLOCK'
To be read with Preliminaries/General conditions.
TYPE(S) OF GLASS BLOCK WALLING
110
MORTAR JOINTED GLASS BLOCK WALLS: EXTERNAL
Drawing reference(s):
Method of assembly: In-situ into formed structural openings.
Glass blocks:
Manufacturer and reference: Roger Wilde Ltd 'FIREBLOCK'
Chareau House, 1 Miles St, Oldham, OL1-3NW
Tel: 0161 624 6824 Fax 0161 627 3770 www.rogerwilde.com
Pattern: clear / wavy
Colour: white
Size: 190 x 190 x 80
Special shapes: None
Mortar: As recommended by glass block installer
Bedding mix: Glass block mortar Pointing mix: As installation mortar
Colour: White
Bond: Stackbond
Joint width: 15mm
Joint profile: semi flush
130
MORTAR JOINTED GLASS BLOCK WALLING: INTERNAL
Drawing reference(s):
Method of assembly: In-situ into formed structural openings.
Glass blocks: As 110
Pattern: clear / wavy
Colour: Clear
Size: 190 x 190 x 80
Special shapes: None
Mortar: As section (see 110)
Colour: White
Bond: Stackbond
Joint width: 15mm
Joint profile: Semi Flush
DESIGN/PERFORMANCE REQUIREMENTS
210
DESIGN:
Complete the detailed design of the glass block walling and associated features shown on the
drawings to meet the requirements of this specification.
220
WEATHER RESISTANCE:
External glass block walling, including junctions with adjacent parts of the building, must be
wind and watertight under all anticipated conditions, with full allowance made for deflections and
other movements.
230
INTEGRITY:
Calculate locations of reinforcement, anchors and other structural requirements to ensure that
external glassblock walling will resist all dead loads and design live loads and accommodate all
deflections and thermal movements without damage.
Calculate wind loads in accordance with CP3: Chapter V: Part 2 (making due allowance for any
internal pressure).
Basic wind speed (V): 42m/s
Topography factor (S1): Seven
Ground roughness, building size and height factor (S2): Determine from CP3: Chapter V: Part 2,
Table 3
Statistical factor (S3): 1
235
INTEGRITY:
Calculate locations of reinforcement, anchors and other structural requirements to ensure that
internal glass block walling will resist all dead loads and design live loads and accommodate all
deflections and thermal movements without damage.
LAYING AND JOINTING
310
GLASS BLOCK SAMPLES: Before commencing glass block walling, provide the CA with two
identified units of each type of block specified or proposed for use.
Obtain approval of appearance before proceeding.
330
REFERENCE PANEL(S):
Construct panels as set out below in an approved location.
Obtain approval of appearance before proceeding.
Glass block walling type F11/130 or 110
Size of panel: As part of the installed works including an example of curved walling if part of works.
340
STORAGE:
Stack glass blocks clear off the ground in a clean, cool, dry area.
Protect from rain and water run off.
Prevent soiling, chipping and contamination by salts and other deleterious substances.
Store premixed mortar or cement and hydrated lime clear off ground in a dry, weatherproof, frostfree area.
Store the sand on a firm, clean, free draining base. Cover to avoid contamination.
Store accessories under cover and protect from damage.
350
SUITABILITY OF SURROUNDS:
Before commencement of glass block walling, carry out a geometric survey of the surrounds.
Report immediately to the C.A., if the surrounds will not allow the required accuracy, or security, of
the walling.
360
PREPARATION:
Apply a separating layer to the areas of base or sill to receive glass block walling, either:
A thick application of bituminous emulsion paint, allowed to dry before placing mortar bed, or
A strip of bitumen felt to BS747 Type 3B, 5B or 5U.
370
ADVERSE WEATHER:
Do not use frozen materials and do not lay glass blocks on frozen surfaces
Do not lay glass blocks when air temperature is at or below 5oC. and falling
Maintain temperature of the work above freezing until mortar has fully hardened
Adequately protect newly erected walling against rain, snow and sun.
Cover when precipitation occurs and at the completion of each days work.
Screen walling exposed to direct sunlight to prevent premature drying of mortar.
Rake out and replace mortar damaged by frost and where instructed, rebuild damaged work.
375
ADVERSE WEATHER:
Do not lay glass blocks on frozen surfaces
Adequately protect newly erected walling against rain, snow and sun.
380
LAYING GLASS BLOCKS WITH MORTAR JOINTS:
Mix mortar to a stiff, workable consistency
Lay the glass blocks on a full, even bed of mortar with a uniform joint width.
Do not shell bed blocks or furrow mortar.
Do not allow mortar to bridge perimeter/expansion joints
Lay patterned blocks aligned to give a consistent overall appearance
Keep courses level and in line and accurately plumb all wall faces, angles and features.
Set out carefully to ensure satisfactory junctions with surrounds or built-in elements and components
Do not use steel tools to tap blocks into position
Prevent extrusion of mortar in tall or solid glass block panels by placing wedges in lower course bed
joints.
Remove wedges before mortar jointing or pointing and fill resulting voids.
390
JOINT REINFORCEMENT:
Reinforcement: A type recommended for the purpose by Roger Wilde ltd.
Locations: Horizontally depending on span direction. Spacing to Wilde's recommendations
Lay continuously, embedded in joints. Keep back not less than 15 mm from glass block faces.
Form around changes in direction, lap joints in length not less than 150 mm and tie where
recommended by Wilde.
Do not restrict movement at perimeter and expansion joints.
Secure at perimeters as recommended by Wilde.
400
ANCHORS:
Anchors: A type recommended for the purpose by Roger Wilde Ltd.
Locations: At all spanning edges
Fix or build into adjacent surrounds and embed in joints as recommended by Wilde.
Do not restrict movement at perimeter joints.
410
PERIMETER/EXPANSION JOINTS WITH SEALANT:
Filler: A type recommended for the purpose by Roger Wilde Ltd (expansion foam)
Build in as work proceeds at jambs, heads and any intermediate expansion joints.
Keep back not less than 10 mm from glass block faces.
Sealant: Silicone
Colour: To match mortar
Prepare joints and apply sealant as section Z22.
Remove any surplus sealant from glass block surfaces as work proceeds, using a clean cloth and
solvents approved by Wilde.
420
SPACERS:
Spacers: A type recommended for the purpose by Roger Wilde Ltd.
Place and build into each mortar joint intersection as work proceeds
Remove re-usable spacers before mortar jointing or pointing and fill resulting voids.
430
MORTAR JOINTING:
Finish joints neatly and consistently to the specified profile before final set.
Remove surplus mortar from glass block faces as jointing proceeds using a clean sponge,
cloth or bristle brush and water.
Do not use abrasive implements or cleaning solutions without approval.
435
MORTAR POINTING:
Rake back bedding mortar 10 mm from glass block faces as laying proceeds and allow to set.
Brush out joints and lightly wet.
Point joints neatly and consistently to the specified profile in a continuous operation.
Remove surplus mortar from glass block faces before final set using a clean sponge,
cloth or bristle brush and water. Do not use abrasive implements or cleaning solutions without
approval.
440
PROTECTION AND FINAL CLEANING:
Prevent staining and other disfigurement of glass block walling during construction and by following
trades.
Prevent damage to glass block walling, particularly at arrises.
Glass Block wall should receive a final clean before element handover.
Main Contractor to Protect with boards, plastics, sheeting etc. securely fixed (if required).